Machine for grinding plow-points



(NoMode1.,)

J. B HUBER.

MACHINE FOR GRINDING PLOW POINTS.

Patented Apr. 6, 1886.

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L//4ZIIIIIIII Attorney h. PETERS. PnoZu-hlnngflnhnr. Washington, D. c.

I l m 1 JOHN B. HUBER, OF SOUTH BEND, INDIANA.

MACHINE FOR GRINDING PLOW-POINTS.

SPECIFICATION forming part of Letters Patent No. 339,421,

Application filed June '16, 1885. Serial No. 168,845.

dated April 6, 1886.

No model.)

T 0 mil whom it may concern:

Be it known that I, JOHN B. HUBER, of South Bend, in the county of St.Joseph and State of Indiana, have invented certain new and usefulImprovements in Machines for Grinding Plow-Points; and I do herebydeclare that the following is a full. clear, and exact descriptionthereof, reference being bad to the accompanying drawings, and to theletters of reference marked thereon, which form part of thisspecification.

This invention relates to mechanism for grinding plow-points,particularly those of chilled metal, its object being to devise meanswhereby the said grinding may beaccomplished much more rapidly and atless cost than by mechanism of the usual construction.

The invention consists, essentially, in securing the point to be groundin a matrix or bed so shaped that the pointlies and is held in thehollow thereof, and pivoting the said matrix on a frame, which theworkman moves in the necessary manner under the grindstone. The flatsurfaces of the block and bed make the matrix adhere with sufficientforce to the bed on the frame on which it is pivoted to prevent itsturning under the action of the stone, but not to prevent its beingturned byhand.

In the drawings, Figure 1 is a side elevation. Fig. 2 is a perspectiveview of the lever. Fig. 3 is a perspective view of the matrix; and Fig.l is a sectional view on line :r :0, Fig. 1.

Referring to the accompanyin g drawings by letter, A designates agrindstone of proper size, journaled in a frame, B, of suitableconstruction, the lowest part of the periphery of the stone being thepoint at which the grinding takes place. The axle on which the stone isfixechand with which it turns,has secured upon it a pulley, B, driven bythe belt I) from an engine or machine supplying sufficient power.

0 is a railway running below the grindstone and parallel with the sidesthereof.

1) is a truck of suitable construction, provided with the wheels (I,which travel on the rails c c of the railway O.

E is a lever having an arm,e',pivoted to the center of the truck D, soas to be capable of vibration up and down thereon. The opposite arm ofthe said lever is provided with a suitmatrix and bed-piece able handle,a, by means of which the lever and truck can be moved back and forth onthe railway C. The central portion of the lever E is formed into abed-piece, F, having its upper surface fiat, and provided centrally witha vertical pin, f, as shown.

G is a cord or rope, one end of which is socured to the arm 0 of thelever E near the handle c,and ascending from the lever passes over apulley, H, and has secured to its depending end a weight, I, which isheavy enough to pull the lever E and bed F up against the grindstonewith sufficient force.

K is the bed or matrix in which the plowpoint to be ground is placed.The matrix has a recess, is, made in its upper surface, conforming tothe shape of the plowpoint, WhlClllS placed thereimthe shape of therecess keeping it well in place. The under surface of the matrix K isfiat and lies upon the bed F of the lever E.

70 is a vertical opening running from the an der surface of the matrix,into which opemng the pin f of the bed F enters, so as to pivot thematrix on the bed, the pin being short enough not to protrudeinto therecess is of the matrix.

The plow-point, being placed in the recess of the matrix, is brought upagainst the edge of the rotating grindstone by the weight Lwhich liftsthe arm 8 of the lever E. The workman can then by means of the handles 6move the plow-point. under the grindstone,so that different partsthereof may be ground as needed. The water and sand or grit descendingfrom the stone pass through the opening it, and, spreading between theadjacent surfaces of the F, aid in causing them to adhere sufficientlyto prevent the action of the stone from turning the matrix on the bed;but their adhesion is not strong enough to prevent the-matrix beingturned by hand to any position required to grind the plow-point in theproper way. Thus by the friction between the surfaces the plow-pointdoes not need to be secured by bolts or pins to the matrix, nor does thematrix need to be similarly secured to the bed of the lever.

The matrix-blocks are by this mechanism made interchangeable, so thatone recessed to accommodate any size or shape of plow-point can bereadily affixed to the bed-piece on the lever.

Having described my invention, I claim' 1. In mechanism to grindplow-points, the combination of a vertically-rotating grindstone,andalever arranged to reciprocate vertically below the same in the plane ofits rotation,with a rope or cord secured to said lever, and having aWeight attached and adapted to draw the lever up toward the grindstone,a bed-piece made on the said lever,and a matrixblock recessed on itsupper surface to receive and hold the plow-point to be ground, andpivoted on the bed-piece in such manner that friction between thesurfaces makes it adhere to the bed-piece with sufficient force toprevent its being turned thereon by the action of the grindstone,substantially as specified.

2. The combination of the rotating grindstone A, the lever E,pivotell onthe bed-plate F, the rope or cord G, passing over the pulley H, andhaving the Weight I attached to its desoending end, sufficiently heavyto pull the attached end of the lever E upward, the matrix K, pivoted onthe bed-piece F, and recessed on its upper surface to receive theplow-point to be ground, the handle e, by means ofwhich the lever E isreciprocated, the truck D, pivoted to the ends of the lever E oppositethe handle, and the rails c 0, upon which the wheels of the trucktravel, all constructed and arranged substantially as set forth.

In testimony that I claim the foregoing as my own Iaffix my signature inpresence of two witnesses.

JOHN B. HUBER.

Witnesses:

J AMES DU SHANE, WILLIS A. BUGBEE.

